Preparation of hydrocarbon gels from ferric sources, polycarboxylic acid compounds, and optional amines, in combination with phosphate esters

ABSTRACT

This invention relates to improved hydrocarbon gels which find use in the fracturing of petroleum producing formations. In particular it relates to the use of a define class of gelling agents for hydrocarbons which provide excellent results in such fracturing. The gelling agents comprise combinations of (1) selected orthophosphate esters and (2) a composition comprising a source of ferric ions, an amine, and a polycarboxylic acid or salt thereof.

RELATED APPLICATION

This application is a continuation-in-part of (a) our U.S. patent Application Ser. No. 08/592,592 filed Jan. 26, 1996 now U.S. Pat. No. 5,614,010 and (b) our U.S. patent application Ser. No. 08/580,171 filed Dec. 28, 1995, now U.S. Pat. No. 5,571,315, both of which are continuations-in-part of U.S. patent application Ser. No. 08/360,438 filed Dec. 21, 1994, now abandoned, which is a division of application Ser. No. 08/209,266 filed Mar. 14, 1994 now U.S. Pat. No. 5,417,287.

TECHNICAL FIELD

This invention relates to improved hydrocarbon gels which find use in petroleum producing formation fracturing. In particular it relates to the use of a defined class of gelling agents for hydrocarbons which provide excellent results in such fracturing. The gelling agents are combinations of (A) selected orthophosphate esters and (B) sources of iron mixed optionally with ammonium sources or alkyl or alkanol amines, and further with polycarboxylic acids or their alkali metal salts. The mixtures (B) may be reacted to form such compounds as ferric ammonium citrate and/or lower alkyl or alkanol derivatives thereof.

BACKGROUND OF THE INVENTION

The development of the use of gelled hydrocarbons as fracturing fluids is reviewed by Weldon M. Harms in a chapter entitled "Application of Chemistry in Oil and Gas Well Fracturing", at pages 59-60 of the book "Oil-Field Chemistry (ACS Symposium#396-1988)" published by the American Chemical Society in 1989. The basic technique of formation fracturing involves the injection of a fracturing fluid down the well bore, which is usually cemented in place and at least 0.3 mile long, and then through horizontal holes in the steel pipe, or casing, of the well, to obtain access to the subterranean formation. The fracturing fluid is under high pressure and must be able to survive the severe shear forces caused when flow is forced through the casing perforations of perhaps 1/4 to 1/2 inch in diameter, as well as the shear forces encountered at the leading edge of the fracture. Whatever chemical additives are used to influence viscosity, induce gel formation, stabilize against resident chemicals, pH or temperature conditions in the formation, inhibit scale formation or corrosion, or inhibit paraffin deposition, for example, must also be able to withstand the shear forces and other inhospitable conditions of use. Most commonly available liquids typically are viscosified before they are particularly effective in carrying the large quantities of proppants widely used in the fracturing process.

When hydrocarbons are used in the fracturing process, they are commonly treated to increase their viscosity. As reviewed by Harms, an early viscosifying agent was napalm, an aluminum soap of fatty acids. Aluminum salts of orthophosphate esters were introduced in the late 1960's, followed by the suggestion of the use of Fe₃ O₄ for combination with the orthophosphate esters, in Monroe U.S. Pat. No. 3,505,374. While many other combinations of metals and other materials have been suggested as viscosifying agents, aluminum crosslinked orthophosphate esters are still, according to Harms, the most widely used.

The aluminum compounds present problems, however, particularly where any significant amount of water is present. They generally will not satisfactorily perform the desired crosslinking function in the presence of more than about 1200 ppm of water, nor where the pH is outside a relatively narrow range. Moreover, an inadvertent excess of aluminum compound treatment is detrimental to the desired performance because the aluminum compound itself adversely affects the pH. The iron provided by ferric salts as in the present invention and described in the parent applications hereof and in related U.S. Pat. No. 5,417,287, on the contrary, permits operation in wider pH ranges.

In describing a gel which can be used as a pig in a pipeline, Jaggard et al in U.S. Pat. No. 4,003,393 recite the possibility of iron as one of a number of metals to combine with a class of aliphatic substituted orthophosphoric esters. No other qualifiers are used to describe the iron, however.

In U.S. Pat. No. 4,153,649, Griffin proposes reacting a pentavalent phosphorous compound with a class of hydroxy ethers before employing the metal salt. Among the metal salts he uses is ferric nitrate, but he further requires a "separate source of base" to be used with the hydroxy ether modified phosphates, as spelled out in column 4, lines 55-58 and column 11, lines 37-68. In the latter passage, the ferric nitrate is combined with ethylene diamine tetraacetic acid, a well-known chelating agent.

Monroe, in U.S. Pat. No. 3,505,374, uses a gelling agent for hydrocarbons characterized as a ferroso-ferric salt of an alkyl oleyl diester of orthophosphoric mono acid. The iron compound is further described as magnetite, or Fe₃ O₄. He suggests this combination for fracturing subterranean oil-bearing formations, but says none of the "other oxidized forms of iron including ferrous and ferric oxides and hydroxides, chlorides, sulfates and nitrates" (col 3, lines 2-4) yielded a gel as obtained with the magnetite.

Burnham, in U.S. Pat. No. 4,200,540, describes a large class of phosphates and phosphate esters which he mixes with aluminum salts, aluminates and aluminum metal. He chooses combinations of the materials as a function of various down-hole temperatures. No mention is made of iron salts; the reference is cited mainly for its comprehensive description of the phosphates deemed to be useful. See also Burnham's U.S. Pat. No. 4,316,810.

In U.S. Pat. No. 5,514,645, McCabe utilizes a reaction product of an inorganic iron or aluminum salt with a C₈₋₁₈ surface active amine to mix with a phosphate ester in a hydrocarbon to viscosify it as a fracturing medium. He does not include a polycarboxylic acid, however, as in the present continuation-in-part application.

A reaction product of citric acid and monoethanolamine is used with phosphoric acid in treating sandstone formations by Young et al in U.S. Pat. No. 4,605,068. The treatment has nothing to do with gelling hydrocarbons, however.

SUMMARY OF THE INVENTION

We have found that ferric salts can be very advantageously used in the gelling of hydrocarbons, particularly for use in formation fracturing, rather than aluminum compounds, for combination with orthophosphate esters. The present continuation-in-part application is concerned specifically with mixtures of ferric salts with amines and polycarboxylic acids, and also with reaction products of polycarboxylic acid in which the polycarboxylic acid moiety has from 2-12 carbon atoms and/or lower alkyl and alkanol derivatives thereof such as, to name a few examples, ferric butanol amine citrate, ferric isopropanolamine citrate, ferric triethanolamine succinate, and ferric dibutanolamine tartrate, i.e. where each alkyl or alkanol moiety may have up to six (6) carbons.

The ferric salts have the advantage that they can be used in the presence of large amounts of water, such as up to 20%. One of the advantages of fracturing with hydrocarbon gels is that some formations may tend to imbibe large quantities of water, while others are water-sensitive and will swell inordinately if water is introduced; our invention permits one to use a hydrocarbon gel in areas where water may cause trouble not only with the formation itself, but with the fracturing agent or the gelling agent. Also, ferric salts are not adversely affected by commonly used alcohols, such as methanol and isopropanol. In addition, they can be used in broad ranges of pH, yet the linkages formed can still be broken with gel breaking additives conventionally used for that purpose. In addition, ferric salts such as ferric sulfate and the more complex ferric salts and other ferric iron sources we se crosslink rapidly and can be made to link even more rapidly with the use of surfactants and/or alkaline or caustic agents such as potassium hydroxide, triethylamine, and triethanolamine.

When dissolved in a hydrocarbon such as gasoline, diesel oil, crude oil, or kerosene, the ferric salt in combination with orthophosphate esters as defined below will cause the hydrocarbon to gel. The gel is generally stable to heat, and the degree of gelling can be controlled by the concentration of orthophosphate ester in the fluid. As further described herein, ferric ammonium (or alkyl or alkanol amine) citrate or other polycarboxylate will generate gels of enhanced strength and temperature resistance. In addition, the apparent chelation of the iron by the polycarboxylic acid moiety inhibits the precipitation of the iron in the form of ferric hydroxide.

Thus our invention includes a method of fracturing a subterranean formation comprising adding to a hydrocarbon liquid to be used as a fracturing fluid (a) about 0.3% to about 1.5% by weight, based on the hydrocarbon liquid, of an organic phosphate of the formula HPO₄ RR' where R is a straight or branch chain alkyl, aryl, alkoxy or alkaryo group having from 6 to about 18 carbon atoms and R' is hydrogen or an aryl, alkaryl, alkoxy or alkyl group having from 1 to about 18 carbon atoms, and (b) a composition comprising (i) a source of ferric iron in an amount effective to form a gel with the phosphate ester in the hydrocarbon (ii) an amine having the general formula ##STR1## where R' is (CH₂)₂₋₆ R⁴, R⁴ is H or OH, R² is (CH₂)₀₋₆ H or (CH₂)₂₋₄ OH,

R³ is R² or ##STR2## and R⁵ is R² or ##STR3## and (iii) a polycarboxylic acid or an alkali metal salt thereof, having from 2-12 carbon atoms and up to three amine groups. The amounts and preferred methods of addition of the amine and polycarboxylic acid are discussed below.

DETAILED DESCRIPTION OF THE INVENTION

The phosphate ester which we use is advantageously added first and mixed with the Diesel fuel or other hydrocarbon to be used as the fracturing agent, generally in amounts from about 0.3% to about 1.5% by weight, based on the total. Then the ferric salt or lower alkyl or alkanol derivative, specifically the ferric ammonium citrate (or other composition comprising ferric salt, amine (if used), and di- tri- or tetra- or pentacarboxylate having 2-12 carbon atoms and up to three amine groups) is added in amounts to provide preferably in the range of about 0.25 mole of ferric iron for each mole of phosphate or phosphate ester to about 2 moles of ferric iron for each mole of phosphate or phosphate ester. In this manner, the process materials can be prepared more or less continuously, as opposed to the batch approach sometimes used in the past. More broadly we may use any amount of ferric salt such as ferric ammonium lower alkyl or alkanolamine polycarboxylate which is effective to make a gel with the phosphate ester. This will be accomplished at about 0.1 to about 2.5 mole of ferric iron for each mole of phosphate ester, preferably 0.8:1 to 1.2:1. Very small amounts (for example less than 0.1 mole/mole of phosphate ester) of ferric ammonium citrate or its lower alkyl or alkanol derivatives or other ferric containing composition as described herein will have at least some gelling effect; amounts over 2 or 2.5 moles/mole of phosphate will generally be superfluous. The choice of ratios will vary with the circumstances and the objectives of the practitioner.

We have also found that surfactants have the effect of decreasing the time for crosslinking. Generally, in the absence of a surfactant, our combination of materials will crosslink in about two minutes at room temperature; when a surfactant is used also, this time is significantly reduced, and in the presence of our preferred class of surfactants, it is reduced to the neighborhood of twenty seconds, as determined by viscosity tests. About 0.1% to about 10% (based on the gelling agent) of surfactant is frequently advantageous also.

The Phosphate Ester

The phosphate derivatives we use are described in the literature as orthophosphate esters. They are similar to those used by Burnham in U.S. Pat. Nos. 4,200,540 and 4,316,810. Griffin U.S. Pat. Nos. 4,174,283 and 4,153,649, and Harris et al in U.S. Pat. No. 4,622,155, having the structural formula ##STR4## where R is a straight or branched chain alkyl, aryl, alkoxy, or alkaryl group having about 6 to about 18 carbon atoms and R' is hydrogen or an aryl, alkaryl, alkoxy, or alkyl group having up to about 18 carbon atoms. This structural formula will be referred to elsewhere herein as HPO₄ RR'.

The Iron Sources

Our preferred original source of the ferric ion is ferric sulfate, but any organic or inorganic ferric salt may be used, and it is apparent that the sulfate or other anion is not important in our invention. In the discussion throughout, it should be understood that where ferric sulfate is mentioned, it could as well be any other ferric salt which will provide the desired ferric ion under the conditions, particularly of solubility, described. Typically we work first with a 50% solution of ferric sulfate.

The Amine

As indicated above, the amine may be any amine having the general formula ##STR5## where R' is (CH₂)₂₋₆ R⁴, R⁴ is H or OH, R² is (CH₂)₀₋₆ H or (CH₂)₂₋₄ OH,

R³ is R² or ##STR6## and R⁵ is R² or ##STR7##

As is seen from the formula, the amine need not be a polyamine and if a monoamine it may be a primary, secondary or tertiary amine. The amine may be a primary, secondary or tertiary amine having at least one substituent alkyl or terminal (OH on the terminus) alkanol group of two to six carbon atoms, the other two substituents being alkyl or terminal (OH on the terminus) alkanol groups having 0-6 carbons. If it is a polyamine, the connecting alkyl groups have two to six carbon atoms and the remaining positions on the nitrogens are filled by alkyl groups of 0-6 carbons or terminal alkanol groups of 2-6 carbon atoms.

The Polycarboxylic Acid

Instead of citric acid, one may use any polycarboxylic acid having from 2 to 12 carbon atoms and up to three amine groups. Suitable examples are oxalic acid, succinic acid, maleic or fumaric acid, tartaric acid, suberic, malonic, glutaric, adipic, pimelic, azeleic, or sebacic acid, nitrilitriacetic acid, ethylene diamine tetraacetic acid (EDTA), phthalic acid, isophthalic acid, and terephthalic acid. The polycarboxylic acids include compounds of the formulas ##STR8##

The Proportions

In making the iron-containing compound for use with the phosphate ester, the carboxylic acid containing compound (typically an alkali metal salt thereof) is added to the combined iron/ammonium, alkyl or alkanol amine as stated above with respect to the addition of citric acid. For effective gelling of the hydrocarbon, the phosphate ester is present in the hydrocarbon in an amount from 0.3 to 1.5% by weight. It is generally most relevant to base the ferric eron content on the phosphate ester, and as little as 0.1 mole of ferric eron per mole of phosphate ester can bake a gel; however, we prefer about 0.25 to 2 moles ferric eron permole of phosphate ester. While 0.1 to 2.5 moles of ferric iron per mole of phosphate ester may be used, amounts greater than 2,5 moles of ferric iron per mole of phosphate ester are generally superfluous. The amine is optional but frequently beneficial. If used, it may be present in an amount up to ten times the amount by weight of the ferric iron. More may be used, but such amounts will generally be superfluous. The polycarboxylic acid or alkali metal salt should be used in amounts from 10:1 to 1:10 weight/weight of the ferric iron. Again, amounts higher than 10:1 may be used but will generally be superfluous; amounts lower than 1:10 may also be used with commensurately small effect.

In the fracturing fluid, the iron from the ferric sulfate or other ferric salt such as ferric ammonium citrate, ferric butyl amine citrate, ferric isopropylamine citrate or ferric trialkanol tartrate, or from the unreacted ferric compound containing composition, including a polycarboxylic acid, forms linkages with the available oxygen, generally in more than one phosphate group, thus forming small chains which cause the hydrocarbon to gel.

It has been demonstrated in the laboratory that our invention may be used to form hydrocarbon gels, and that the gels can be broken in a manner familiar to persons who work with hydrocarbon gels in the field such as by the addition of common alkaline materials. In the following examples, the procedure was to employ a laboratory Waring blender with a voltage regulator set at 30. 300 ml of Diesel oil was placed in the blender and the power turned on. The phosphate ester preparation was first added and after it was blended, the ferric salt solution was introduced by pipette. The time was recorded from the initial introduction of the ferric compound to the gel point, determined by a concave shape of the material in the blender.

Blending was continued to determine the time required to reach maximum gel, which was estimated to be the first sign of conversion of the shape of the material to convex instead of concave. The blending was then stopped and the material transferred to a sample container, observing the consistency of the gel. Brookfield viscosity readings were then taken as shown in the Table I.

In the examples below, Composition M is about two-thirds phosphate ester of the above formula HPO₄ RR', together with triethanolamine, and solvent. Composition L contains about two-thirds phosphate ester HPO₄ RR', together with triethylamine, and high flash aliphatic solvent. Composition K is two-thirds of the same phosphate ester and 15.5 g 45% KOH, also with a solvent. Composition F contains about 27% ferric sulfate, together with ethylene glycol, mixed surfactants, triethanolamine, and water. In each case, the amounts of composition M shown were added first to the Diesel oil and blended; then the amount shown of Composition F was added and blended. Results are presented in Table I.

                  TABLE I                                                          ______________________________________                                         Ex  M      F      X-link                                                                               Invers                                                                               Spindl                                                                               5 min                                                                               30 min                                                                               60 min                          ______________________________________                                         1   3 ml   3 ml   20 sec                                                                               30 sec                                                                               #3    2500 --    3890                            2   3 ml   3 ml   20 sec                                                                               30 sec                                                                               #3    2300 --    3460                            3   3 ml   3 ml   25 sec                                                                               35 sec                                                                               #3    2375 --    3400                            4   3 ml   3 ml   30 sec                                                                               60 sec                                                                               #4    6360 11000 13800                           5   3 ml   3 ml   30 sec                                                                               55 sec                                                                               #4    7320 12300 13500                           6   3 ml   3 ml   45 sec                                                                               none at 180 sec.                                       7   2 ml   2 ml   60 sec                                                                               150 sec                                                                              #4    --   --    --                              8   3 ml*  3 ml   20 sec                                                                               55 sec                                                                               #3    10000.sup.&                                                                         --    13000.sup.&                     9   6 ml*  3 ml   15 sec                                                                               30 sec                                                                               #4    --   --    21500.sup.&                     10  2 ml.sup.$                                                                            3 ml   20 sec                                                                               35 sec                                                                               #4    13650.sup.&                                                                         --    13850.sup.&                     ______________________________________                                          *Composition L used instead of M                                               .sup.$ Composition K used instead of M                                         .sup.& rotation at 10 rpm                                                

Persons skilled in the art will recognize from Table I that the formulations make excellent gels.

In a separate experiment, it was shown that the order of addition of the phosphate ester solution (sometimes herein called the gellant) and the ferric sulfate (or other iron salt such as ferric ammonium citrate) component (activator) is not important. In this experiment, 6.16 g deionized water and 1.3 g ferric sulfate were added to 85.95 g Diesel oil and mixed with the blender; then 0.4 ml of phosphate esters of the formula HPO₄ RR' was added and inversion took place in about one minute.

The data in Table II demonstrate that our hydrocarbon gel former will operate in the presence of significant amounts of water; indeed the viscosity increases with increasing amounts of water. In this experiment, an initial mixture was made as above with 4 g of gellant and 10 g of activator in about 250 g of Diesel oil. Water was then added incrementally and the viscosity measured immediately.

                  TABLE II                                                         ______________________________________                                         Cumulative    Viscosity                                                        Water, %      (511 sec.sup.-1)                                                 ______________________________________                                         0.65%          1cp                                                             1.27%          6cp                                                             2.16%         12cp                                                             2.78%         19cp                                                             3.50%         26cp                                                             4.18%         29cp                                                             5.06%         30cp                                                             6.17%         *                                                                7.58%         *                                                                8.38%         *                                                                10.41%        *                                                                14.78%        *                                                                20.2%         *                                                                ______________________________________                                          *Dial bouncing and unreadable; excellent lipping gel observed.           

Additional tests were made as shown in Table III, which records the viscosities achieved by various combinations within our invention.

                  TABLE III                                                        ______________________________________                                         ml M  ml F   cps        ml other     comment                                   ______________________________________                                         3     3      13,800                                                            3     3      13,500                                                            2     2      (bouncing dial)                                                   a     3      13,000                                                            b     3      21,500     6TEA*                                                  c     3      13,900     2KOH                                                   3     3      15,000                                                            3     3      16,000                                                            d     3       5,800     low acid value PE                                      e     3       9,400     high acid value PE                                     f     3      20,800     KOH                                                    g     3      11,300     1/2KOH                                                 3     3       7,000     1/2KOH                                                 3     3       8,600     no TEA in F                                            3     3       8,700     KOH in M; no TEA in F                                  3     3      14,500     KOH in M; no TEA                                       3     3      13,400                                                            3     3      --         4400 cps @ 20 rpm                                      i     3       9,300                                                            j     3      20,400                                                            2 ml  3      12,700                                                            2 ml  1.5    8,300                                                             k     1.5    10,000                                                            l     1.5    12,500     2 ph est; KOH; 1.5 Fe                                  3     3      14,700                                                            m     3      20,000                                                            3     3      23,000     0.25 g Na.sub.2 CO.sub.3                               n     3      21,000                                                            o     3      18,400     0.25 g NA.sub.2 CO.sub.3                               3     3      19,500     0.5 g CaCl.sub.2                                       p     3      13,800     0.5 g CaCl.sub.2                                       2     3       7,000                                                            q     3      11,600                                                            r     3      12,100                                                            3     3      10,500                                                            3     3      10,500     Fe Citrate                                             3     3       9,700                                                            3     3       6,800     Fe Citrate                                             u     3       8,200                                                            v     3      18,400     Na.sub.2 CO.sub.3                                      w     3      21,000     Na.sub.2 CO.sub.3                                      x     3      10,000                                                            y     3      11,000                                                            aa    2       6,700                                                            bb    1        780                                                             cc    4      12,300                                                            dd    3      13,000                                                            ee    4      12,200                                                            ff    5      12,000                                                            gg    6      11,500                                                            hh    7      12,300                                                            ii    9      11,500                                                            jj    11     11,400                                                            kk    13     13,300                                                            ll    17     11,800                                                            mm    3      10,900                                                            nn    3      14,700                                                            oo    2      14,900                                                            pp    4      14,900                                                            qq    6      12,500                                                            rr    8      12,700                                                            ss    11     10,400                                                            tt    15      7,600                                                            ______________________________________                                    

In Table III, the following notes apply to the column headed "ml Other":

    ______________________________________                                         a        triethylamine with phosphate ester of M -- 3 ml                       b        triethylamine with phosphate ester of M -- 6 ml                       c        KOH with phosphate ester of M -- 2 ml                                 d        triethanolamine with varied phosphate ester -- 3 ml                   e        triethanolamine with varied phosphate ester -- 3 ml                   f        KOH with phosphate ester of M -- 3 ml                                 g        same as f with half as much KOH -- 3 ml                               h        same as g with half as much KOH -- 3 ml                               i,m,n,o,p                                                                               KOH with phosphate ester of M -- 3 ml                                 k,l      KOH with phosphate ester of M -- 2 ml                                 q,r,s    KOH with varied phosphate ester -- 2 ml                               t,u,v,w,x,y                                                                             no alkali; phosphate ester of M -- 3 ml                               aa       3 ml non-neut phosphate ester; 2 ml F                                 bb       3 ml non-neut phosphate ester; 1 ml F                                 cc       3 ml non-neut phosphate ester; 4 ml F                                 dd       3 ml KOH-treated phosphate ester; 3 ml F                              ee       3 ml KOH-treated phosphate ester; 4 ml F                              ff       3 ml KOH-treated phosphate ester; 5 ml F                              gg       3 ml KOH-treated phosphate ester; 6 ml F                              hh       3 ml KOH-treated phosphate ester; 7 ml F                              ii       3 ml KOH-treated phosphate ester; 9 ml F                              jj       3 ml KOH-treated phosphate ester; 11 ml F                             kk       3 ml KOH-treated phosphate ester; 13 ml F                             ll       3 ml KOH-treated phosphate ester; 17 ml F                             mm       3 ml non-neut phosphate ester; 3 ml F                                 nn       3 ml non-neut phosphate ester; 2 ml F                                 oo       3 ml M; 4 ml F                                                        pp       3 ml M; 6 ml F                                                        qq       3 ml M; 8 ml F                                                        rr       3 ml M; 11 ml F                                                       ss       3 ml M; 15 ml F                                                       ______________________________________                                    

From the above table III, it is apparent that a broad range of ferric salts, neutralizing agents, and other additives such as breakers, and other materials are not detrimental to the gelling abilities of our invention.

In the following Table IV, ferric salts as shown were used in combination with a standard 3 ml concentration of phosphate ester solution, some with KOH and some without, in 300 ml oil. The viscosity was measured with a #4 spindle at 10 rpm unless otherwise noted.

                  TABLE IV                                                         ______________________________________                                         Iron salt   ml Fe    Viscosity Comment                                         ______________________________________                                         Fe Citrate  3         6,800                                                    Fe Citrate  1         8,800                                                    Fe Citrate  3        16,700                                                    Fe Citrate  3         7,000+                                                   Fe Citrate  2         8,000                                                    Fe Citrate  2.5       3,300    #3 spndl; 10 rpm                                Fe Citrate  2.5       3,200    #3 spndl; 10 rpm                                Fe Citrate  2.5       3,200    #3 spndl; 10 rpm                                Fe Citrate  2.5       2,700    #3 spndl; 10 rpm                                Fe Amm Sulf 1        13,000                                                    Fe Amm Sulf 1         3,500    (20 rpm)                                        Fe Amm Sulf 1.5      14,700                                                    Fe Amm Sulf 1.5      15,000                                                    Fe Chloride 3         6,200                                                    Fe Chloride 2         7,600                                                    Fe Sulfate  1         9,700                                                    Fe Sulfate  1.5      14,000                                                    Fe Sulfate  1         7,000                                                    Fe Amm Citrate                                                                             3        12,000                                                    Fe Gluconate                                                                               3        4,600                                                     ______________________________________                                    

A further series of tests was conducted specifically with ferric ammonium citrate, ferric butylamine citrate, and ferric isopropylamine citrate. Ferric ammonium citrate was made according to the procedures described by Kruse and Mounce in U.S. Pat. No. 2,644,828, which is hereby incorporated herein by reference in its entirety. Because the structural formula of this composition is uncertain, i.e. the amount of NH₃ appears to vary with the color and physical form (see the listing of Ammonium Ferric Citrate in the Merck index, Eighth Edition), we intend to include within the definition of ferric ammonium citrate any of the compositions contemplated within the aforesaid Kruse et al '828 patent. Both brown and green crystalline forms are described in the '828 patent. Generally, the procedure we followed was to form a solution of ammonium hydroxide and ferric sulfate, thus forming a ferric hydroxide precipitate, to which was added citric acid to form the ferric ammonium citrate. We intend to include ferric ammonium citrate made by any method, however. Likewise, the related, or derivative, as sometimes called herein, materials ferric butylamine citrate and ferric isopropylamine citrate are made in a similar manner, substituting butyl amine for the ammonium hydroxide or substituting isopropylamine for the ammonium hydroxide. In the case of isopropylamine, the designation "Fe IPA" in Table V means monoisopropylamine citrate and "Fe MIPA" means that the isopropylamine used to form the citrate was a mixture of monoisopropylamine, diisopropylamine, and triisopropylamine. Thus the term "ferric ammonium citrate or a lower alkyl substituted derivative thereof" is intended to include all versions of ferric ammonium citrate as described in the aforementioned Kruse and Mounce patent and those in which the ammonium moiety is substituted by amines having one, two or three alkyl groups, each having up to six carbon atoms. In each of the runs for which the results are shown in Table V, 3 ml of a 67% solution of the designated phosphate ester gelling agent (Phosphate esters R, S, and T in Table V are similar to those used in Table I, all within the previously defined formula HPO₄ RR') was mixed with a 3 ml solution (100% active) of the ferric citrate shown in 300 ml of Diesel oil and gels were formed by stirring at low speed for two minutes. As is known in the art, the Marsh funnel test (last column) measures the time for 100 ml of the gel to discharge from a standard funnel.

                  TABLE V                                                          ______________________________________                                         Phosphate           Gel     Formed Marsh                                       Ester     Citrate   Eval    (seconds)                                                                             (seconds)                                   ______________________________________                                         R         Fe Amm    good    12     235                                         S         Fe Amm    excel   17     291                                         T         Fe Amm    excel   --     239                                         R         Fe Bu Am  excel   13     94                                          T         Fe Bu Am  excel   --     17                                          S         Fe Bu Am  excel   --     7                                           R         Fe IPA    excel   27     18                                          T         Fe IPA    excel   31     10                                          S         Fe IPA    excel   24     6                                           R         Fe MIPA   excel   16     78                                          S         Fe MIPA   excel   44     6                                           T         Fe MIPA   excel   --     8                                           ______________________________________                                    

A further comparison of a phosphate ester gelled with ferric sulfate and the same phosphate ester gelled with ferric ammonium citrate showed the ferric ammonium citrate with a Farm 50 viscosity of 895-860 cps at 180° F. while the ferric sulfate had a Fann 50 viscosity of 400-300 cps at 180° F.

In the following examples, a 50% ferric sulfate solution was used. About 14% by weight of the amine and about 14% by weight isopropanol were added to the ferric sulfate solution, with or without a polycarboxylic acid or an alkali metal salt thereof as indicated in the examples, to make an iron containing solution. Sufficient iron containing solution was then added to 300 ml Diesel oil containing about 0.3% phosphate ester to provide 0.6% of the iron containing solution in it, and the mixture was stirred and observed for the formation of a gel.

EXAMPLE 11

various amines

    ______________________________________                                                      gel time                                                          ______________________________________                                         cyclohexylamine                                                                               1:20                                                            butylamine     1:00 note --                                                                               Marsh funnel                                                                   @ 1%: 11:27 min                                     dicyclohexylamine                                                                             2:00                                                            propylamine    2:00                                                            morpholine     3:00                                                            ______________________________________                                    

EXAMPLE 12

polycarboxylic acid

Here 30 g of the indicated polycarboxylic acid were added to 100 g of a 50% ferric sulfate solution; the Diesel oil had 1% phosphate ester in it. Fe/Al means that one-fifth of the iron was replaced with aluminum.

    ______________________________________                                                          gel time                                                      ______________________________________                                         Fe EDTA*           1:55                                                        Fe citrate         1:27                                                        Fe/Al EDTA*        1:00; Marsh 2:30                                            Fe/Al citrate      1:00; Marsh 1:34                                            ______________________________________                                          *Ethylene diamine tetraacetic acid                                       

EXAMPLE 13

Amino Chelates

In these experiments, ammonium hydroxide or the indicated substitute (a molar equivalent to precipitate the Fe⁺³) was added to 100 g of 50% ferric sulfate solution, and 30 g of the chelant (citric acid or other polycarboxylic acid) was then added, followed by mixing; this was used to combine with the phosphate ester/Diesel oil mixture.

    ______________________________________                                         Ferric monoisopropanolamine                                                                          170 sec.sup.-1 ; 385 cps                                 citrate (FANN 50 @ 22O F.:                                                     Ferric ammonium/nitrilotriacetic acid:                                                               gel formed                                               Ferric Ammonium Oxalate:                                                                             gel formed                                               Ferric Ammonium Gluconate:                                                                           gel formed                                               ______________________________________                                    

EXAMPLE 14

Chelates

The following results were obtained using 2% (based on the Diesel oil) iron chelates indicated mixed with 1% phosphate ester in Diesel oil:

    ______________________________________                                                                 gel                                                    ______________________________________                                         Diethylene triamine pentaacetic acid                                                                     fair                                                 (Formula II above):                                                            Triamine tetraacetic acid of formula (III) above:                                                        good                                                 (Formula III above:                                                            Ferric gluconate:         excellent                                            Ferric tartrate:          excellent                                            ______________________________________                                    

EXAMPLE 15

Alkanolamine Citrates

In these cases the ferric sources were made by first preparing 100 g of a 50% solution of ferric sulfate, then adding the indicated amine and citric acid (both molar equivalents of the ferric iron). The resulting composition was stirred and added to Diesel oil containing 1% phosphate ester to provide 1% ferric iron in the oil. The results were as follows:

    ______________________________________                                         Momoethanolamine; Citric Acid                                                                         excellent gel                                           Triethanolamine; Citric Acid                                                                          Very good gel                                           Monoethanolamine; Citric Acid;                                                 Partially neutralized phos ester                                                                      very good gel                                           Triethanolamine; Citric Acid;                                                  Partially neutralized phos ester                                                                      excellent gel                                           ______________________________________                                     

We claim:
 1. Method of fracturing a subterranean formation comprising adding to a hydrocarbon liquid to be used as a fracturing fluid (a) about 0.3% to about 1.5% by weight, based on the hydrocarbon liquid, of an organic phosphate of the formula HPO₄ RR' where R is a straight or branch chain alkyl, aryl, alkoxy or alkaryl group having from 6 to about 18 carbon atoms and R' is hydrogen or an aryl, alkaryl, alkoxy or alkyl group having from 1 to about 18 carbon atoms, and (b) a composition comprising (i) ferric iron in an amount sufficient to form a gel with said organic phosphate in said hydrocarbon liquid, and (ii) a polycarboxylic acid or an alkali metal salt thereof, having from 2-12 carbon atoms and up to three amine groups, and fracturing a subterranean formation with said hydrocarbon liquid.
 2. Method of claim 1 wherein said composition (b) is added in an amount sufficient to provide 0.1 to 2.5 mole(s) of ferric iron for each mole of phosphate ester present in said hydrocarbon.
 3. Method of claim 1 wherein said polycarboxylic acid or alkali metal salt thereof is present in a weight ratio of about 1:10 to about 10:1 to said ferric iron.
 4. Method of claim 1 wherein an amine of the formula ##STR9## where R' is --(CH₂)₂₋₆ R⁴, R⁴ is H or OH, R² is --(CH₂)₀₋₆ H or --(CH₂)₂₋₄ OH,R³ is R² or ##STR10## and R⁵ is R² or ##STR11## is also a part of composition (b), in a weight ratio to ferric iron of 1:10 to 10:1.
 5. Method of claim 1 wherein said polycarboxylic acid or alkali metal salt thereof is ethylene diamine tetraacetic acid or an alkali metal salt thereof.
 6. Method of claim 1 wherein said polycarboxylic acid or alkali metal salt thereof is nitrilotriacetic acid or an alkali metal salt thereof.
 7. Method of claim 1 wherein said polycarboxylic acid or an alkali metal salt thereof is tartaric acid.
 8. Method of claim 1 wherein said polycarboxylic acid or an alkali metal salt thereof is citric acid.
 9. Method of claim 1 wherein said polycarboxylic acid as of the formula ##STR12##
 10. A composition for viscosifying a hydrocarbon containing a phosphate ester comprising (a) ferric iron (b) a polycarboxylic acid or alkali metal salt thereof having 2-12 carbon atoms and up to three amine groups in a weight ratio to said ferric iron of about 1:10 to about 10:1, and (c) an amine of the formula ##STR13## where R' is --(CH₂)₂₋₆ R⁴, R⁴ is H or OH, R² is --(CH₂)₀₋₆ H or --(CH₂)₂₋₄ OH,R³ is R² or ##STR14## and R⁵ is R² or ##STR15## in an amount up to about ten times by weight of the ferric iron.
 11. Composition of claim 10 wherein said polycarboxylic acid or alkali metal salt thereof is ethylene diamine tetraacetic acid or an alkali metal salt thereof.
 12. Composition of claim 10 wherein said polycarboxylic acid or alkali metal salt thereof is nitrilotriacetic acid of an alkali metal salt thereof.
 13. Composition of claim 10 wherein said polycarboxylic acid or alkali metal salt thereof is tartaric acid.
 14. Composition of claim 10 wherein said polycarboxylic acid or alkali metal salt thereof is citric acid.
 15. A viscous fracturing fluid comprising a hydrocarbon liquid including about 0.3% to 1.5% by weight of an organic phosphate gelling agent, about 0.1 to about 2.5 mole(s) of ferric iron for each mole of phosphate gelling agent, a polycarboxylic acid or alkali metal salt thereof in a weight ratio of 1:10 to 10:1 to the ferric iron, and up to ten times the weight of the ferric iron of an amine of the formula ##STR16## where R' is (CH₂)₂₋₆ R⁴, R⁴ is H or OH, R² is (CH₂)₀₋₆ H or (CH₂)₂₋₄ OH,R³ is R² or ##STR17## and R⁵ is R² or ##STR18##
 16. Fracturing fluid of claim 15 wherein said polycarboxylic acid is of the formula ##STR19##
 17. Fracturing fluid of claim 15 wherein said polycarboxylic acid or alkali metal salt thereof is ethylene diamine tetraacetic acid or an alkali metal salt thereof.
 18. Fracturing fluid of claim 15 wherein said polycarboxylic acid or alkali metal salt thereof is nitrilotriacetic acid.
 19. Fracturing fluid of claim 15 wherein said polycarboxylic acid or alkali metal salt thereof is tartaric acid.
 20. Fracturing fluid of claim 15 wherein said polycarboxylic acid or alkali metal salt thereof is citric acid.
 21. Fracturing fluid of claim 15 wherein said polycarboxylic acid or alkali metal salt thereof is of the formula ##STR20## or an alkali metal salt thereof. 